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Once a woman has been using combined hormonal contraceptives for three cycles or more, she calculates her veset days considering only what happened in her last three cycles of pills. She should note each cycle how many days passed from the last active pill until the onset of her flow (staining does not count), and what onah (day or night) the flow began, and use that as the basis for her calculations. The number of active pills she takes any particular cycle does not matter.
If indeed you have not established a veset kavua, you need only observe one veset day, based on what happened in your most recent cycle. (This is the ruling of our site’s rabbinic supervisor, Rav Kenneth Auman. Other halachic authorities may require additional veset days and you may want to ask your own Rav). For example, if in your most recent cycle you took your last active pill on a Sunday morning and your flow began Wednesday morning, then your veset day for the next cycle will be three days after your last active pill, during the daytime onah.
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This response was updated on 8 May 2022.